Can someone please explain to me why Fluther has been getting a lot of questions about recovering xlsx files?

Lately, I have been seeing a bunch of questions about recovering xlsx files. When I log on to Fluther in the wee hours of the morning, Eastern Standard Time, these questions are here. I see that they seem to get deleted. (if you search for the term “xlsx” you will see a few, one just one day ago, one just this morning).

What do the questions mean?

Why are they deleted?

Why, most recently, are there questions on this at least once a week?